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L-3 <br /> • Year 7: Reclamation of the South Haul Road(21 acres),which will include ripping/scarification, <br /> replacement of growth medium, and revegetation, all of which will be accomplished within the <br /> context of routine operations. <br /> • All Years: As specified in Exhibit D: Mine Plan, routine mining operations will ensure that pit <br /> perimeter"highwalls"will be left in a 3H:1 V slope gradient condition,or less. The 3H:1 V design <br /> objective will approximate natural angle of repose for the sand material; and,it is anticipated that <br /> drying conditions, etc. will further reduce the slope gradient, ensuring post-mining conditions <br /> conducive to the post-mining land use designation as"rangeland". <br /> Final Site Closure <br /> Final site closure obligations are addressed in Table L-1, and CSC has broken down these remaining <br /> obligations into the following components: <br /> • Plant Area and Facilities <br /> To include the following: <br /> o Plant dismantlement and transport to the Denver metropolitan area for disposition, either <br /> as saleable used equipment. CSC has relied upon a vendor-supplied quote(lump sum),to <br /> include all equipment, material, and labor requirements necessary to accomplish full <br /> demolition. No provision for salvage value(if any)has been taken. <br /> o Demolition of concrete foundations/footers to nominal 18-inch depth below ground surface <br /> and placement/consolidation within pit void immediately adjacent to plant area. <br /> o Concrete and/or asphaltic surfaced roadways demolition and placement/consolidation <br /> within pit void immediately adjacent to plant area,followed by ripping/scarification of sub- <br /> base. <br /> o Regrade and recontouring of entire plant and facilities area (54 acres) to approximate <br /> original contours and drainage conditions. <br /> Keenesburg No. 2 Mine_112 Reclamation Operation—November 22, 2019 <br />